| In the case of AMS-221EN without AW-3S, approximately 30 seconds are generally required every time the operator changes the bobbin thread manually. On the other hand, in the case of AMS-221EN installed with AW-3S, the bobbin thread is automatically changed while the operator picks up the sewn product and places a new material to be sewn on the sewing machine, thereby eliminating the downtime due to manual changing of the bobbin thread. As a result, productivity is increased. Considering that bobbin thread changing has always been an obstacle to automatization, AW-3S opens up further possibilities for automatization. |
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| Device | AW-3S |
| Sewing machine head to which the device is installed | AMS-221EN / AMS-224EN （sewing machine head with a shuttle hook） |
| Applicable bobbin and bobbin case | Exclusive bobbin and bobbin case |
| Thread | #5～#30, 135～45（TEX）, 020～060（TKT） |
| Applicable types of thread | Tetoron thread, nylon thread |
| Remaining thread removal operation, bobbin winding and threading operations |
Automatic（while the sewing machine is in operation） |
| Input device | IP-420（for AMS-221EN / AMS-224EN） |
| Power requirement | Single-phase 100～240V |
| Power consumption | Lifting amount: 20mm / Stroke: Standard 4mm (0~10mm) |
| Compressed air | 100 VA |
| Max air consumption | 0.5 Mpa |
| Needle thread tension | 156dm3（ANR）/min |
| Bobbin thread changing is carried out frequently. In general, the operator manually changes the bobbin. By retrofitting AW-3S to the sewing machine, not only the bobbin can be automatically changed before it runs out of thread, but also an empty bobbin can be wound with thread during sewing. The operator is able to concentrate on sewing without worrying about the remaining amount of the bobbin thread. In addition, the operator neither need to worry about the timing of changing the bobbin nor have to replace the bobbins by himself/herself. Moreover, only two bobbin cases are used alternately in repetition. It means that uniform bobbin thread tension and consistent seam quality are achieved without requiring additional adjustment of the bobbin thread tension. |
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| When loading a sewing pattern, AW-3S automatically calculates the bobbin thread amount to be consumed to sew the next sewing pattern and determines whether the sewing machine can complete the sewing of the pattern with the bobbin thread amount remaining before starting sewing. If the remaining amount of the bobbin thread is not enough for sewing the loaded sewing pattern, AW-3S will automatically change the bobbin to another bobbin that is fully wound with thread. （AW-3S is able to automatically wind the preset amount of thread on a bobbin.） In addition, AW-3S gradually adjusts the length of thread remaining on the bobbin that has to be removed to an appropriate length. |
| Since AW-3S automatically feeds the bobbin thread, it is no longer necessary for the operator to get under the machine to manually change the bobbin thread. This contributes to the reduction of the operator's fatigue. With AW-3S, the operator is able to concentrate on sewing work without worrying about the remaining amount of the bobbin thread. In addition, AW-3S allows even a new operator who has just joined the company to carry out sewing work immediately. |
